curl --request POST \
  --url https://{baasHost}/api/v1/wms/wallets \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "customerId": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
  "productCode": "CSAV"
}
'

{
  "id": "a1b2c3d4-0000-0000-0000-000000000000",
  "customerId": "aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee",
  "productCode": "CSAV",
  "fspAccountId": "4921",
  "createdAt": "2026-01-01T10:00:00.000Z"
}